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Discontinued Operations (Amounts Reported as Discontinued Operations in the Consolidated Statements of Comprehensive Earnings) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Oil, gas and NGL sales | $ 263 | $ 1,227
Oil, gas and NGL derivatives |  | (113)
Marketing and midstream revenues |  | 38
Total revenues | 263 | 1,152
Production expenses | 214 | 599
Exploration expenses |  | 13
Marketing and midstream expenses |  | 18
Depreciation, depletion and amortization |  | 205
Asset impairments | 182 | 785
Asset dispositions | 1 | (222)
General and administrative expenses | 3 | 34
Financing costs, net | (3) | 87
Restructuring and transaction costs | 9 | 248
Other expenses | 9 | 17
Total expenses | 415 | 1,784
Loss from discontinued operations before income taxes | (152) | (632)
Income tax expense (benefit) | (24) | (358)
Loss from discontinued operations, net of tax | (128) | (274)
Earnings (loss) from discontinued operations before income taxes | (152) | (632)
Barnett Shale [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Oil, gas and NGL sales | 263 | 486
Total revenues | 263 | 486
Production expenses | 214 | 306
Depreciation, depletion and amortization |  | 77
Asset impairments | 182 | 748
Asset dispositions | (4) | 1
Other expenses | 10 | 11
Total expenses | 402 | 1,143
Loss from discontinued operations before income taxes | (139) | (657)
Income tax expense (benefit) | (11) | (142)
Loss from discontinued operations, net of tax | (128) | (515)
Earnings (loss) from discontinued operations before income taxes | (139) | (657)
Canada [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Oil, gas and NGL sales |  | 741
Oil, gas and NGL derivatives |  | (113)
Marketing and midstream revenues |  | 38
Total revenues |  | 666
Production expenses |  | 293
Exploration expenses |  | 13
Marketing and midstream expenses |  | 18
Depreciation, depletion and amortization |  | 128
Asset impairments |  | 37
Asset dispositions | 5 | (223)
General and administrative expenses | 3 | 34
Financing costs, net | (3) | 87
Restructuring and transaction costs | 9 | 248
Other expenses | (1) | 6
Total expenses | 13 | 641
Loss from discontinued operations before income taxes | (13) | 25
Income tax expense (benefit) | (13) | (216)
Loss from discontinued operations, net of tax |  | 241
Earnings (loss) from discontinued operations before income taxes | $ (13) | $ 25

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